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<?xml version="1.0" encoding="UTF-8"?>
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  <title>Qt 4.8: Thread Support in Qt</title>
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    <a href="index.html" class="qtref"><span>Qt Reference Documentation</span></a>
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<a class="nextPage" href="threads-starting.html">Starting Threads with QThread</a>
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<h3><a name="toc">Contents</a></h3>
<ul>
<li class="level1"><a href="#topics">Topics:</a></li>
<li class="level1"><a href="#recommended-reading">Recommended Reading</a></li>
<li class="level1"><a href="#the-threading-classes">The Threading Classes</a></li>
</ul>
</div>
<h1 class="title">Thread Support in Qt</h1>
<span class="subtitle"></span>
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<div class="descr"> <a name="details"></a>
<p>Qt provides thread support in the form of platform-independent threading classes, a thread-safe way of posting events, and signal-slot connections across threads. This makes it easy to develop portable multithreaded Qt applications and take advantage of multiprocessor machines. Multithreaded programming is also a useful paradigm for performing time-consuming operations without freezing the user interface of an application.</p>
<p>Earlier versions of Qt offered an option to build the library without thread support. Since Qt 4.0, threads are always enabled.</p>
<a name="topics"></a>
<h2>Topics:</h2>
<ul>
<li><a href="#recommended-reading">Recommended Reading</a></li>
<li><a href="#the-threading-classes">The Threading Classes</a></li>
<li><a href="threads-starting.html">Starting Threads with QThread</a></li>
<li><a href="threads-synchronizing.html">Synchronizing Threads</a></li>
<li><a href="threads-reentrancy.html">Reentrancy and Thread-Safety</a></li>
<li><a href="threads-qobject.html">Threads and QObjects</a></li>
<li><a href="threads-qtconcurrent.html">Concurrent Programming</a></li>
<li><a href="threads-modules.html">Thread-Support in Qt Modules</a></li>
</ul>
<a name="recommended-reading"></a>
<h2>Recommended Reading</h2>
<p>This document is intended for an audience that has knowledge of, and experience with, multithreaded applications. If you are new to threading see our Recommended Reading list:</p>
<ul>
<li><a href="http://www.amazon.com/exec/obidos/ASIN/0134436989/trolltech/t">Threads Primer: A Guide to Multithreaded Programming</a></li>
<li><a href="http://www.amazon.com/exec/obidos/ASIN/0131900676/trolltech/t">Thread Time: The Multithreaded Programming Guide</a></li>
<li><a href="http://www.amazon.com/exec/obidos/ASIN/1565921151/trolltech/t">Pthreads Programming: A POSIX Standard for Better Multiprocessing</a></li>
<li><a href="http://www.amazon.com/exec/obidos/ASIN/1565922964/trolltech/t">Win32 Multithreaded Programming</a></li>
</ul>
<a name="the-threading-classes"></a>
<h2>The Threading Classes</h2>
<p>These classes are relevant to threaded applications.</p>
<table class="annotated">
<tr class="odd topAlign"><td class="tblName"><p><a href="qtconcurrentrun.html">Asynchronous Run</a></p></td><td class="tblDescr"><p>The &lt;QtConcurrentRun&gt; header provides a way to run a function in a separate thread.</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qtconcurrentfilter.html">Concurrent Filter and Filter-Reduce</a></p></td><td class="tblDescr"><p>The &lt;QtConcurrentFilter&gt; header provides concurrent Filter and Filter-Reduce.</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qtconcurrentmap.html">Concurrent Map and Map-Reduce</a></p></td><td class="tblDescr"><p>The &lt;QtConcurrentMap&gt; header provides concurrent Map and MapReduce.</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qatomicint.html">QAtomicInt</a></p></td><td class="tblDescr"><p>Platform-independent atomic operations on integers</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qatomicpointer.html">QAtomicPointer</a></p></td><td class="tblDescr"><p>Template class that provides platform-independent atomic operations on pointers</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qfuture.html">QFuture</a></p></td><td class="tblDescr"><p>Represents the result of an asynchronous computation</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qfuturesynchronizer.html">QFutureSynchronizer</a></p></td><td class="tblDescr"><p>Convenience class that simplifies QFuture synchronization</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qfuturewatcher.html">QFutureWatcher</a></p></td><td class="tblDescr"><p>Allows monitoring a QFuture using signals and slots</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qmutex.html">QMutex</a></p></td><td class="tblDescr"><p>Access serialization between threads</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qmutexlocker.html">QMutexLocker</a></p></td><td class="tblDescr"><p>Convenience class that simplifies locking and unlocking mutexes</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qreadlocker.html">QReadLocker</a></p></td><td class="tblDescr"><p>Convenience class that simplifies locking and unlocking read-write locks for read access</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qreadwritelock.html">QReadWriteLock</a></p></td><td class="tblDescr"><p>Read-write locking</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qrunnable.html">QRunnable</a></p></td><td class="tblDescr"><p>The base class for all runnable objects</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qsemaphore.html">QSemaphore</a></p></td><td class="tblDescr"><p>General counting semaphore</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qthread.html">QThread</a></p></td><td class="tblDescr"><p>Platform-independent threads</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qthreadpool.html">QThreadPool</a></p></td><td class="tblDescr"><p>Manages a collection of QThreads</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qthreadstorage.html">QThreadStorage</a></p></td><td class="tblDescr"><p>Per-thread data storage</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qwaitcondition.html">QWaitCondition</a></p></td><td class="tblDescr"><p>Condition variable for synchronizing threads</p></td></tr>
<tr class="odd topAlign"><td class="tblName"><p><a href="qwritelocker.html">QWriteLocker</a></p></td><td class="tblDescr"><p>Convenience class that simplifies locking and unlocking read-write locks for write access</p></td></tr>
<tr class="even topAlign"><td class="tblName"><p><a href="qtconcurrent.html">QtConcurrent</a></p></td><td class="tblDescr"><p>High-level APIs that make it possible to write multi-threaded programs without using low-level threading primitives</p></td></tr>
</table>
<p><b>Note:</b> Qt's threading classes are implemented with native threading APIs; e.g&#x2e;, Win32 and pthreads. Therefore, they can be used with threads of the same native API.</p>
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